Because a human is operating it. You don't pay a truck or an airplane, you pay the people who drive, fly, maintain, and generally operate them.

In that case, please just use the AI yourself and don't hire anyone ever.

Do it yourself then if you prefer. Same as it's ever been.

I wait for the day when the employer, the management, the business analyst, and the customer can get to state expected behaviour. Nevermind using AI. On all my projects programme was never a problem, it was non-competent people going "Make it good, if it makes big bucks and line go up, don't even bother with that. Make what good? Everything.".

If you think LLMs will make irrational people go "Ahhh I get it, I can't throw money and yelling at a shower idea and be the next Xooglebookflix" you will be surprised.